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Splash Screen. Lesson 8 Contents. Obj. #1: Find percent of increase. Example 1 Find Percent of Change Example 2 Find Percent of Increase Example 3 Find Percent of Increase Obj. #2: Find Percent of decrease. Example 4 Find Percent of Decrease. Lesson 8 Contents. Practice and Apply

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  1. Splash Screen

  2. Lesson 8 Contents Obj. #1: Find percent of increase. Example 1Find Percent of Change Example 2Find Percent of Increase Example 3Find Percent of Increase Obj. #2: Find Percent of decrease. Example 4Find Percent of Decrease

  3. Lesson 8 Contents Practice and Apply Obj. #1: Find percent of increase. 11, 17, 19 (alt. 11, 19) Obj. #2: Find Percent of decrease. 13, 15, 21 (alt. 13, 21) Maintaining Your Skills 29-37

  4. Step 1Subtract to find the amount of change. Step 2Write a ratio that compares the amount of change to the original amount. Express the ratio as a percent. Substitution. Example 8-1a Obj. #1: Find percent of increase Find the percent of change from 325 to 390.

  5. Write the decimal as a percent. Example 8-1b Obj. #1: Find percent of increase Answer: The percent of change from 325 to 390 is 20%.

  6. Step 1Subtract to find the amount of change. Step 2Write a ratio that compares the amount of change to the original tuition. Express the ratio as a percent. Example 8-2a Obj. #1: Find percent of increase Tuition In 1965, when John entered college, the tuition per year was $7500. In 2000, when his daughter went to the same school, the tuition was $25,500. Find the percent of change.

  7. Substitution. Write the decimal as a percent. Example 8-2b Obj. #1: Find percent of increase Answer: The percent of change is 240%. In this case, the percent of change is a percent of increase.

  8. Example 8-3a Obj. #1: Find percent of increase Multiple-Choice Test Item Refer to the table shown. Which county had the least percent of increase in population from 1990 to 2000? A Breckinridge B BrackenC Calloway D Fulton

  9. Example 8-3a Obj. #1: Find percent of increase Read the Test ItemPercent of increase tells how much the population has increased in relation to 1990. Solve the Test ItemUse a ratio to find each percent of increase. Then compare the percents.

  10. Example 8-3b Obj. #1: Find percent of increase • Breckinridge • Bracken

  11. Example 8-3c Obj. #1: Find percent of increase • Calloway • Fulton Eliminate this choice because the population decreased. Answer: Bracken County had the least percent of increase in population from 1990 to 2000. The answer is B.

  12. Example 8-1c Obj. #1: Find percent of increase

  13. Example 8-1c Obj. #1: Find percent of increase Find the percent of change from 84 to 105. Answer: The percent of change from 84 to 105 is 25%.

  14. Example 8-2c Obj. #1: Find percent of increase Textbooks In 1990, the price of a textbook was $38. In 2000, the price of the same textbook was $81. Find the percent of change. Answer: The percent of change was about 113%. In this case, the percent of change is a percent of increase.

  15. Example 8-3d Obj. #1: Find percent of increase Multiple-Choice Test Item The table shows test scores on the first two math tests of the semester for four students. Which student had the greatest percent of increase from test 1 to test 2? A Holly B Ben C Sally D Max

  16. Example 8-3e Obj. #1: Find percent of increase Answer: Max had the greatest percent of increase from test 1 to test 2. The answer is D.

  17. Step 1Subtract to find the amount of change. Step 2Compare the amount of change to the original price. Example 8-4a Obj. #2: Find percent of decrease Clothing A $110 sweater is on sale for $88. What is the percent of change?

  18. Substitution. Write the decimal as a percent. Example 8-4b Obj. #2: Find percent of decrease Answer: The percent of change is –20%. In this case, the percent of change is a percent of decrease.

  19. Example 8-4c Obj. #2: Find percent of decrease

  20. Example 8-4c Obj. #2: Find percent of decrease Shoes A $145 pair of tennis shoes is on sale for $105. What is the percent of change? Answer: The percent of change is about –27.6%.

  21. End of Lesson 8

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